The only simple part of this is the bindings: get the Dynafit Vertical ST, or the Vertical FT12 if you really need a release setting higher than 10. Or an older Dynafit model if you find a really great deal (which is almost impossible…), or the new G3 Meetu if you feel its differences merit the extra pound of weight. (The only other AT binding models are either for hybrid bc/resort use, or for compatibility with mountaineering boots.)
Boots, although nowhere near as prolific as alpine downhill boots, you still have your choice of five companies (Dynafit, BD, Garmont, Scarpa, Dalbello), and the range in terms of weight vs. stiffness is huge – even just from Dynafit, everything from the four-pound (per pair!) DyNA to the twice-as-heavy Titan (compatible with both alpine downhill bindings and AT). Scarpa has a similar range (from the F1 Carbon to Skookum), while Garmont, BD ,and Dalbello are more focused on the stiffer end of the spectrum.
Skis, the choices go on forever, including any “flat” alpine downhill model and many AT-specific skis (including Dynafit models that have predrilled plugs to accept Dynafit or G3 Meetu bindings).